Means for securing curved form-plates in rotary printing-machines



' (No Model.)

Patented Apr. AZ6, 1887.

No. 361,821. A

o o 0 0 O 0 @l l( 0 0 o o o o 0 0 o o o D o o 0 O o QN() o o o o o o o N o 0 0 `D o o om l 0 o lo o Q 01") l@ o o o Q Q o D 0 0 0 o l@ o o o @Qc o 1 0 0 o 0 c o n2 F o o o o o o 0 o o o o 0 o o o o o o o I o o e. 0 O f1 o o o H NITED STATES PATENT OFFICE.

JOHN T. HAVVKINS, OF TAUNTON, MASSACHUSETTS.

MEANS FOR SECURING CURVED FORM-PLATES iN ROTARY PRINTING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 361,821, dated April 26, 1887.

pplication filed .Tuly S, 1886. Serial No. 207,417. (No model.)

To all whom, it may concern:

Be it known that I, JOHN T. HAWKINs, of Taunton, in the count-y of Bristol and State of Massachusetts, haveinvented a new and useful Means for Securing Curved Form- `Plates to the Cylinders of Rotary Printing- Machines, which invention or 'improvement is fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to provide a simple and reliable means for securing curved plates for book or pamphlet forms on the cy lindrical surface of the printing-cylinder of a rotary printing-machine in such a Way that the dimensions and positions of the pageplates may be changed at will.

In the printing from book or pamphlet forms made up of pages of matter and intervening blank margins, it is desirable to have for each page a separate plate, and in order to print forms of that character containing axis, and sliding therein correspondinglyshaped blocks, portions of which project above the cylinders surface, and by means of end screws and said blocks clamping the plates by end pressure in the direction of the cylinders axis; and in some cases circumferential grooves of similar character with sliding blocks have been used for holding the platesl in the other direction. These grooves, however, being fixed in position, permit only of a limited variation in the sizes of the plates. .Another method has been to screw the plates fast to the surface of the turtle or cylinder by drilling through blank places in the plates, the surface of the turtle or cylinder being drilled or tapped in the corresponding posi-- tions for the reception of screws. Many plates, however, cannot be so drilled, and the drilling and tapping of holes, indiscriminately in the turtle or cylinder soon becomes objectionable, a hole thus drilled rarely being required a second time in the same place.

tapped, so that said plates, rabbeted on edge and held by said clamps formed to lie upon these rabbeted ed ges, may be secured by screws in the regularly spaced screw holes above mentioned, thus holding the plates by direct pressure upon `the cylinders surface.

In the accompanying drawings, Figure l is a view, in plan, of a turtle or form-bed constructed according to my invention, the upper left-hand quarter of which is shown without plates upon it, the other three-quarters having portions of a sixteen-page form se cured thereto. Fig.V 2 is a side elevation, and Fig. 3 a sectional end elevation, of Fig. 1. Fig. 4 is an enlarged sectional view showing more clearly the form of clamp and plate; and Fig. 5` shows a clamp, on an enlarged scale, slotted for the reception of the screwhead.

In said figures the several parts areindicated by numbers, as follows: 1 indicates the turtle; 2, the plates; 3, the clamps; 4, the screw-holes, and 5 the screws. The slotted clamps, as shown in Fig. 5, it will be seen, will permit of their use even when the screwholes do not present themselves in the center of the margin-spaces, as may sometimes be the case.

I do not claim, broadly, the securing of plates to a turtle byV means of clamps and screws; but,

As of my invention, I claim- In a rotary printing-machine, in combinaclosely spaced and staggered inthe surface thereof, a series of adjustable clamps, as 3, secured to said cylinder by screws, as 5, whose IOO limit of adjustment corresponds with the disable upon the said cylinder or turtle without tance between said Screw-hole@` whereby any disturbing the others, substantially as and for number of rabbeted plates of any desired dithe purposes set forth.

mensions Within the area limit of the cylinder JOHN T. HAVVKINS. 5 or turtle may be secured upon said cylinder Witnesses:

or turtle without end-thrust upon said plates7 ELIsHA` T. JAoKsoN,

and each plate also made separately adjust- ALBERTJ. PARK. 

